startList = function() {
   if (document.all&&document.getElementById) {
      navRoot = document.getElementById("nav");
      for (i=0; i<navRoot.childNodes.length; i++) {
         node = navRoot.childNodes[i];

         if (node.nodeName=="LI") {
             node.onmouseover=function() {
                this.className+=" over";
             }

              node.onmouseout=function() {
                this.className=this.className.replace(" over", "");
            }

       }
    }
 }
}
window.onload=startList;